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US5156025A - Control apparatus for a laundry washing and/or drying machine - Google Patents

Control apparatus for a laundry washing and/or drying machine Download PDF

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Publication number
US5156025A
US5156025A US07/769,545 US76954591A US5156025A US 5156025 A US5156025 A US 5156025A US 76954591 A US76954591 A US 76954591A US 5156025 A US5156025 A US 5156025A
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US
United States
Prior art keywords
control apparatus
laundry
control unit
counter
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/769,545
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English (en)
Inventor
Giuseppe Frucco
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Zanussi SpA
Original Assignee
Zanussi Elettrodomestici SpA
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Filing date
Publication date
Application filed by Zanussi Elettrodomestici SpA filed Critical Zanussi Elettrodomestici SpA
Assigned to ZANUSSI ELETTRODOMESTICI S.P.A. A CORPORATION OF PORDENONE, ITALY reassignment ZANUSSI ELETTRODOMESTICI S.P.A. A CORPORATION OF PORDENONE, ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FRUCCO, GIUSEPPE
Application granted granted Critical
Publication of US5156025A publication Critical patent/US5156025A/en
Assigned to ELECTROLUX ZANUSSI ELETTRODOMESTICI S.P.A. reassignment ELECTROLUX ZANUSSI ELETTRODOMESTICI S.P.A. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ZANUSSI ELETTRODOMESTICI S.P.A.
Assigned to ELECTROLUX ZANUSSI S.P.A. reassignment ELECTROLUX ZANUSSI S.P.A. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: ELECTROLUX ZANUSSI ELETTRODOMESTICI S.P.A.
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/06—Type or material
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry

Definitions

  • the invention relates generally to a control apparatus for a laundry washing and/or drying machine and, in particular, to a control apparatus which identifies the type of fabrics present in the drum of the machine for laundering or drying, and automatically selects the most suitable program cycle for the laundering or drying of the fabrics.
  • Known laundry washers are provided with an electromechanical or electronic program control unit, the latter type usually including a microprocessor, for controlling the execution of predetermined laundering cycles.
  • Such known laundry washers are also typically provided with a number of pushbutton switches associated with various types of fabrics, i.e. wool, cotton, synthetics, etc., of the laundry to be laundered. Each of these switches is actuated in accordance with the type of fabrics be laundered, to thereby selecting in a per se known manner the most suitable program cycle for the laundering of specific fabrics.
  • program control units of the general type described above are designed to optimize the execution of laundering cycles in accordance with predetermined parameters such as type and quantity of the fabrics to be laundered. These predetermined parameters are accessed by the program control unit upon actuation of associated selector pushbuttons, thereby obtaining satisfactory results of the laundry washing operation with the lowest possible consumption of water, detergents and electric energy. While machines of this construction function in a satisfactory and reliable manner, they still require a number of pushbuttons for selecting the type of fabrics to be laundered because they are incapable of automatically selecting and controlling the execution of optimized laundering cycles in accordance with the type of fabrics present in the drum of the machine.
  • FIG. 1 shows an electric circuit diagram of a control apparatus for a laundry washer in accordance with a preferred embodiment of the invention.
  • the control apparatus depicted in FIG. 1 drawing is designed for an otherwise not shown conventional laundry washer having a laundering tub with a rotatable drum for containing the laundry to be washed, and a window or door for closing the front access opening of the drum.
  • the laundry washer also includes a substantially conventional microprocessor program control unit 1 programmed to store a number of different laundering program cycles. The program cycles are selected by respective per se known selector elements (not shown) associated with the program control unit, in accordance with the type and quantity of the fabrics of the laundry to be washed.
  • the program control unit 1 is electrically connected to various electric components of the machine such as heater elements, pressure switches, solenoid valves and the like, to control the activation and deactivation of these electric components in accordance with the selected laundering cycle.
  • the electric circuit of the control apparatus includes at least one discharge element 2 or the like, preferably in the form of a conventional gap arrester.
  • the discharge elements electrodes 3 and 4 are each electrically connected to a respective sensor 5, 6 which detects the electrostatic charge of the laundry resulting from the friction of the different pieces of the laundry between one another and the internal walls of the drum as the later is being rotated.
  • Sensors 5 and 6 are disposed inside the drum at spaced locations permitting them to come into contact with the laundry, preferably on the inside wall surface of the closure window or door.
  • the electrodes 3, 4 of discharge element 2 are steadily charged in response to the electrostatic charges produced in the laundry and detected by sensors 5 and 6, resulting in an abrupt discharge between the two electrodes as soon as the predetermined dielectric strength of the discharge element is exceeded.
  • the present control apparatus is based on the recognition that the electrostatic charging of the laundry proceeds more or less rapidly in accordance with the type of the laundry fabrics present in the laundry tub. Therefore, the breakdown voltage of discharge element 2 is attained after periods of different duration for different types of fabrics.
  • electrodes 3 and 4 are connected respectively to sensor 5 and a stabilized DC reference voltage source Vcc, and to sensor 6 and to ground M.
  • Electrode 3 is also connected by way of a shunt circuit 7, a trigger circuit 8, and a flip-flop 9, to a digital counter 10 itself connected to the output of a clock signal generator 11 which generates a square wave signal of a predetermined frequency to aid the determination of the duration of the charging period of discharge element 2 as will be described hereafter.
  • Shunt circuit is designed to receive the short voltage pulses generated by the discharge of the electrostatic charges accumulated by electrodes 3, 4 of discharge element 2, and to convert these pulses into pulses of a shape permitting them to be subsequently processed. These pulses are then applied to trigger circuit 8 which converts them into corresponding square wave pulses of a predetermined duration.
  • the square wave pulses generated by trigger circuit 8 are applied to flip-flop 9 which in response to each commutation generates a signal to be applied to counter 10. Hence, the counting operation of counter 10 is stopped at the instant of discharge through discharge element 2, thereby permitting the type of fabrics of the laundry to be washed to be determined in the manner to be described hereafter.
  • Counter 10 is connected to microprocessor program control unit 1 by way of a conventional digital comparator circuit 12 and a pair of logic AND gates, 13 and 14.
  • the two logic AND gates 13 and 14 have their first inputs 15 and 16, respectively connected to counter 10 by way of comparator 12, and their second inputs 17 and 18, respectively, connected to the output 19 of flip-flop 9, itself connected to input 20 of counter 10.
  • the output terminals 21 and 22 of gates 13 and 14, respectively, are directly connected to microprocessor program control unit 1.
  • the digital comparator 12 is provided with plurality of first inputs 23 connected to digital counter 10, and a plurality of second inputs 24 having applied thereto predetermined reference voltages in an encoded form.
  • the reference voltages have been experimentally determined and correspond to respective counting periods of counter 10, as calculated from the instant at which the electrostatic charges generated by the movement of the laundry in the drum, commence to be accumulated on the electrodes 3 and 4 of discharge element 2, to the instant at which these charges are discharged through the dielectric of the discharge element in response to attaining its dielectric strength.
  • some of the plurality of second inputs 24 of comparator 12 are connected to a range of predetermined reference voltages in encoded form corresponding to a relatively long charging time of discharge element 2 indicative of the presence of cotton fabrics, while others of these encoded reference voltages correspond to shorter charging periods of discharge element 2 and are thus indicative of the presence of synthetic fabrics.
  • the outputs 25 and 26 of comparator 12 connected to first inputs 15 and 16 of logic AND gates 13 and 14, respectively are commuted from one logic state to the other.
  • the present control apparatus operates as follows: After the laundry has been deposited into the drum, and prior to the admission of water and detergents to the tub of the machine, microprocessor program control unit 1 starts the rotation of the drum, with the resultant agitation of the laundry, and at the same time generates an enable signal 27 to be applied to clock signal generator 11. Under these conditions, while the laundry commences to produce friction-generated electrostatic charges which are progressively accumulated on electrodes 3 and 4 of discharge element 2, clock signal generator 11 starts to generate square wave-shaped clock signals which are counted by digital counter 10 to thereby determine the duration of the period required for the accumulation of the electrostatic charges generated by the laundry on the electrodes of the discharge element. The counter being enabled to execute this counting operation because during this initial stage there occurs no switching operation of flip-flop 9, so that the latter does not generate a counter disable signal.
  • Digital counter 10 converts the counted square wave-shaped clock signals into determined voltage levels to be applied to comparator 12, which acts to continually compare the output of the counter 10 to the above-mentioned reference voltage levels. As digital counter 10 counts the square wave-shaped clock signals, the result of the comparison is indicated at the two outputs 25 and 26 of comparator 12 by their assuming logic level "1" or "0", resulting in that inputs 15 and 16 of logic AND gates 13 and 14, respectively, are at the same level.
  • the other output 26 of comparator 12 is maintained at logic level "0" because the discharge of the electrostatic charges through the dielectric of discharge element 2 occurred after the reference voltage applied to comparator 12 has attained the range indicative of the presence of, for instance, cotton fabrics. Therefore, the output 22 of AND gate 14 remains at logic level "0".
  • clock signal generator 11 acts to reset counter 10 to zero in preparation for a renewed counting operation.
  • comparator 12 is reset to thereby commutate to logic level "0" the output of the logic AND gate which had been at logic level "1".
  • the present control apparatus is thus returned to a state of preparedness for identifying the type of laundry fabrics and for automatically selecting the suitable laundering cycle in the manner described.
  • counter 10 clock signal generator 11, digital comparator 12 and logic AND gates 13 and 14 may be incorporated or integrated in microprocessor 1 to thereby simplify the circuitry of the present control apparatus.
  • the apparatus may otherwise also be used in laundry drying machines by suitably adapting it for identification of the fabrics to be dried and for the automatic selection of suitable drying cycles in a procedure similar to the one described.
  • the thus designed control apparatus is capable of rapidly and automatically identifying the type of fabric of the laundry to be laundered and/or dried in a laundry washer and/or dryer, and of automatically selecting the most suitable laundering and/or drying cycle without the aid of conventionally provided pushbuttons used for selecting the respective cycles in accordance with the types of fabrics to be laundered and/or dried, to result in a simplification of the construction and operation of these machines.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
US07/769,545 1990-10-09 1991-10-01 Control apparatus for a laundry washing and/or drying machine Expired - Fee Related US5156025A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45760A/90 1990-10-09
IT04576090A IT1242802B (it) 1990-10-09 1990-10-09 Dispositivo di controllo per macchina lavatrice e/o asciugatrice di biancheria

Publications (1)

Publication Number Publication Date
US5156025A true US5156025A (en) 1992-10-20

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Family Applications (1)

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US07/769,545 Expired - Fee Related US5156025A (en) 1990-10-09 1991-10-01 Control apparatus for a laundry washing and/or drying machine

Country Status (5)

Country Link
US (1) US5156025A (it)
EP (1) EP0480387B1 (it)
DE (1) DE69111176T2 (it)
ES (1) ES2078409T3 (it)
IT (1) IT1242802B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345060A (en) * 1991-07-19 1994-09-06 U.S. Philips Corporation Iron comprising a type-of-fabric detector
US5475201A (en) * 1993-02-25 1995-12-12 Black & Decker Inc. Method for identifying a diffusely-reflecting material
WO1997010376A1 (en) * 1995-09-12 1997-03-20 Motorola Inc. Smart laundry system and methods therefor
US5704136A (en) * 1996-05-13 1998-01-06 Lg Electronics Inc. Drying operation adjusting method for washing machine
US5897672A (en) * 1997-12-05 1999-04-27 General Electric Company Clothes fabric type blend detection method and apparatus
CN1073648C (zh) * 1995-08-25 2001-10-24 Lg电子株式会社 滚筒式洗衣机的干燥方法
US20030061840A1 (en) * 2000-03-18 2003-04-03 Hird Malcolm John Laundry appliance
US20070127174A1 (en) * 2005-12-07 2007-06-07 Innolux Display Corp. Method for preventing erroneous resetting of electronic device due to electrostatic discharge
US20100253550A1 (en) * 2009-04-02 2010-10-07 Mstar Semiconductor, Inc. Digitizing Apparatus, Digitizing Method and Capacitance Touch Sensing Apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602006004775D1 (de) * 2005-10-28 2009-02-26 Arcelik Anonim Sirketi Tuzla Waschtrockner
TR201819477A2 (tr) * 2018-12-14 2020-06-22 Arcelik As Teksti̇l ti̇pi̇ni̇n beli̇rlenmesi̇ni̇ sağlayan bi̇r teksti̇l i̇şleme ci̇hazi

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738034A (en) * 1985-12-16 1988-04-19 Kabushiki Kaisha Toshiba Drying machine
JPS6471099A (en) * 1987-09-10 1989-03-16 Mitsubishi Electric Corp Plasma device
JPH02220698A (ja) * 1989-02-22 1990-09-03 Toshiba Corp 乾燥機
JPH03147500A (ja) * 1989-11-01 1991-06-24 Matsushita Electric Ind Co Ltd 消音装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809924A (en) * 1971-11-05 1974-05-07 Siemens Elektrogeraete Gmbh Method and apparatus for controlling the drying operation in an appliance such as a dryer, washer-dryer or the like
DE2756224C3 (de) * 1977-12-16 1981-08-27 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Schaltungsanordnung zum Feststellen der in einem Wäscheposten enthaltenen Restfeuchtigkeit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738034A (en) * 1985-12-16 1988-04-19 Kabushiki Kaisha Toshiba Drying machine
JPS6471099A (en) * 1987-09-10 1989-03-16 Mitsubishi Electric Corp Plasma device
JPH02220698A (ja) * 1989-02-22 1990-09-03 Toshiba Corp 乾燥機
JPH03147500A (ja) * 1989-11-01 1991-06-24 Matsushita Electric Ind Co Ltd 消音装置

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345060A (en) * 1991-07-19 1994-09-06 U.S. Philips Corporation Iron comprising a type-of-fabric detector
US5475201A (en) * 1993-02-25 1995-12-12 Black & Decker Inc. Method for identifying a diffusely-reflecting material
CN1073648C (zh) * 1995-08-25 2001-10-24 Lg电子株式会社 滚筒式洗衣机的干燥方法
WO1997010376A1 (en) * 1995-09-12 1997-03-20 Motorola Inc. Smart laundry system and methods therefor
US5704136A (en) * 1996-05-13 1998-01-06 Lg Electronics Inc. Drying operation adjusting method for washing machine
US5897672A (en) * 1997-12-05 1999-04-27 General Electric Company Clothes fabric type blend detection method and apparatus
US20030061840A1 (en) * 2000-03-18 2003-04-03 Hird Malcolm John Laundry appliance
US6843079B2 (en) * 2000-03-18 2005-01-18 Dyson Limited Laundry appliance
US20070127174A1 (en) * 2005-12-07 2007-06-07 Innolux Display Corp. Method for preventing erroneous resetting of electronic device due to electrostatic discharge
US8020024B2 (en) * 2005-12-07 2011-09-13 Chimei Innolux Corporation Method for preventing erroneous resetting of electronic device due to electrostatic discharge
US20100253550A1 (en) * 2009-04-02 2010-10-07 Mstar Semiconductor, Inc. Digitizing Apparatus, Digitizing Method and Capacitance Touch Sensing Apparatus
US8410958B2 (en) * 2009-04-02 2013-04-02 Mstar Semiconductor, Inc. Digitizing apparatus, digitizing method and capacitance touch sensing apparatus
TWI395124B (zh) * 2009-04-02 2013-05-01 Mstar Semiconductor Inc 數位化裝置、數位轉換方法及電容式觸控面板裝置

Also Published As

Publication number Publication date
DE69111176D1 (de) 1995-08-17
EP0480387B1 (en) 1995-07-12
IT1242802B (it) 1994-05-18
DE69111176T2 (de) 1995-11-16
IT9045760A1 (it) 1992-04-09
IT9045760A0 (it) 1990-10-09
ES2078409T3 (es) 1995-12-16
EP0480387A1 (en) 1992-04-15

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362